Re: [CAD_CAM_EDM_DRO] Re: Stepper Motor and Cable Shielding. Any tips?

actually, some logic analyzers (my hp for instance) can also work in analog
mode, think
8 trace scope...

Erie Patsellis
Shelbyville Design & Signworks
1309 W. S. 7th Street
Shelbyville, IL 62565
(217)774-4444
visit our website at www.shelbyvilledesign.com

----- Original Message -----
From: "Peter Homann" <peter.homann@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, July 25, 2002 6:11 PM
Subject: RE: [CAD_CAM_EDM_DRO] Re: Stepper Motor and Cable Shielding. Any
tips?


> Hi,
>
> Logic analysers are designed for digital circuitry, oscilloscopes for
> analogue circuitry. To check out the stepper drive circuitry, both devices
> are useful. The oscilloscope can be used to "see" noise in the power
supply,
> such as ripple, voltage spikes etc. Affordable oscilloscopes usually have
2
> channels (they can display 2 separate waveforms at once) and have no
storage
> capability.
>
> The logic analyser can only present the data as either Hi (5V) or Lo (0v).
> The advantage of the logic analyser is that it can capture 8, 16 or more
> channels at once, and captures a number of samples, i.e.; 1024 or more.
>
> A logic probe shows the state of a single line, Hi, Lo, open, or clocking.
> You cannot "See" the signal, determine the frequency if it is changing or
> measure it in the time domain (frequency).
>
> With the data from the logic analyser, I can measure the period between
the
> step pulses and determine it is constant and not jittering.
>
> I hope this helps.
>
>
> Peter Homann
> <mailto:peter.homann@...>
> Work : +61 3 8530-7755
> Adacel Technologies Ltd Fax : +61 3 9596-2960
> 250 Bay St, Brighton 3186, VIC, AUSTRALIA Mobile : 0421 601665
> http://www.adacel.com.au Australian Software Engineering Excellence
>
>
> > -----Original Message-----
> > From: eforum3001 [mailto:eforum@...]
> > Sent: Thursday, 25 July 2002 11:23 PM
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: [CAD_CAM_EDM_DRO] Re: Stepper Motor and Cable Shielding. Any
> > tips?
> >
> >
> > Jon Elson <elson@p...> wrote:
> >
> > > A logic analyzer is something like a digital storage oscilloscope,
> > except
> > > that it only has 1 and zero readings for each input channel. the
> > advantage
> > > is that it usually has many channels, so it can examine a whole
> > address
> > > and data bus at one time. But, it still can be useful for looking
> > at long
> > > trains of pulses, especially if it has a long capture record.
> > >
> > > So, yes, it tells you a lot more than a logic probe, which is
> > limited by
> > > what your eye can capture.
> >
> > How much more useful is an oscilloscope cf with logic analyser? I
> > suppose the analyser can't tell when the pulse train is not "clean"?
> >
> > Hoping to hear about the experience of those who had found the
> > analyser/scope, eg:
> >
> > "When the x-axis started to lose steps, I connected the analyser to
> > the pulse generator, and found that .......... etc. etc.
> >
> > Thanks in advance
> >
> > Peter
> >
> >
> >
> >
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> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this as a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
>
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